To turn off your Apple Watch, follow these simple steps:
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Press and hold the side button (the elongated button below the Digital Crown) on your Apple Watch until the power options appear.
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Slide the "Power Off" slider from left to right. This is usually displayed at the top of the screen when the power options appear.
Your Apple Watch will now power down. To turn it back on, simply press and hold the side button until the Apple logo appears.